CN112518049B - Tapping machine for small thread with screw tap anti-breaking protection function - Google Patents
Tapping machine for small thread with screw tap anti-breaking protection function Download PDFInfo
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- CN112518049B CN112518049B CN202011495854.3A CN202011495854A CN112518049B CN 112518049 B CN112518049 B CN 112518049B CN 202011495854 A CN202011495854 A CN 202011495854A CN 112518049 B CN112518049 B CN 112518049B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/16—Thread cutting; Automatic machines specially designed therefor in holes of workpieces by taps
- B23G1/18—Machines with one working spindle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/44—Equipment or accessories specially designed for machines or devices for thread cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G11/00—Feeding or discharging mechanisms combined with, or arranged in, or specially adapted for use in connection with, thread-cutting machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
- B23Q17/2233—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work for adjusting the tool relative to the workpiece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
- B23Q5/58—Safety devices
Abstract
The tapping machine for the small threads with the screw tap anti-breaking protection function is provided, wherein a motor output shaft is connected with the upper end of a main shaft in a main shaft part through a coupler; the lower end of the main shaft part is provided with a tapping torque protection part, and the motor drives the main shaft part and the tapping torque protection part to rotate and then drives a screw tap clamped at the lower end of the tapping torque protection part to rotate; the action end of the over-torque signal feedback device is connected with the tapping torque protection part, and the signal feedback end of the tapping torque protection part is connected with the main shaft; the main shaft part is connected with an operating handle, and the main shaft part is provided with a tapping depth limiting device which controls the motor to rotate reversely after the tapping depth is in place. The invention solves the problems of low efficiency in small thread tapping and difficulty in accurately setting the number of turns of the motor to control the positive and negative rotation of the motor, greatly improves the processing precision and the production efficiency of the small thread tapping, realizes automatic tapping of small threads, realizes no thread breakage in the tapping process, reduces the labor intensity and improves the processing efficiency.
Description
Technical Field
The invention belongs to the technical field of tapping machines in machining, and particularly relates to a tapping machine for small threads with a screw tap breakage prevention protection function.
Background
Along with the development of science and technology, the processing capacity of modern industry is stronger and stronger, with the proposal of China manufacturing 2025 mouth number, the requirements of China manufacturing industry on the processing precision and the processing efficiency of parts are higher and higher, the problem of improving the working efficiency in daily work is urgent, the existing connecting pieces all need to be processed at two ends to realize the connection relation of other two main components, the traditional processing is single tapping, the tapping is almost the only and completely feasible process method for processing small screw holes, particularly for the screw holes with small diameters of M1-M3 mm, the most application is semi-automatic or manual tapping at present, namely, the surface of a workpiece to be processed is placed in an oriented mode manually and is placed on a tapping machine for manual tapping or semi-automatic tapping by using a motor, the working efficiency is low, the labor intensity is high, the torque protection is unreliable and is not suitable for the current automatic large-scale production, in the rotation process of the machine, the running degree, the abrasion degree and the working state of the screw tap cannot be accurately determined, the workpiece is easily damaged, a certain rejection rate is generated, manual operation also has certain insecurity, and the daily work and production are not facilitated, so that improvement is needed for solving the problems.
Disclosure of Invention
The technical problems solved by the invention are as follows: the tapping machine for small threads with the screw tap anti-breaking protection function is provided, a main shaft part with a tapping torque protection part fixed at the lower end is fixed on an upright post on a base through a cantilever, a motor arranged at the top of the main shaft part provides rotary power for a main shaft in the main shaft part to realize the rotation of the screw tap clamped at the lower end of the tapping torque protection part, an over-torque signal feedback device with an action end connected with the main shaft part and a signal feedback end connected with the tapping torque protection part feeds back an over-torque signal to a control unit, the control unit controls the motor to play the anti-breaking protection function on the screw tap after being reversely rotated, the problems that the efficiency in small thread tapping is low and the motor is difficult to accurately set the number of turns to control the forward and reverse rotation of the motor are effectively solved, the processing precision and the production efficiency of the small thread tapping are greatly improved, and the automatic tapping of the small threads is realized by the arrangement of a tapping depth limiting device, the automatic part cutting machine has the advantages of reducing scrapping of parts, reducing labor intensity, improving machining efficiency, along with compact structure, high automation degree and low cost.
The technical scheme adopted by the invention is as follows: the tapping machine for the small threads with the screw tap breakage-proof protection function comprises a base and an upright post fixed on the base, wherein a cantilever is arranged on the upright post, a main shaft part is fixed at the outer end part of the cantilever, a motor base is fixed at the top of the main shaft part, a motor is arranged on the motor base, and an output shaft of the motor is connected with the upper end of a main shaft in the main shaft part through a coupler; the lower end of the main shaft part is provided with a tapping torque protection part, and the motor drives the main shaft and the tapping torque protection part to rotate and then drives a screw tap clamped at the lower end of the tapping torque protection part to rotate; the tapping torque protection device comprises a tapping torque protection part, a signal feedback end and a signal feedback end, wherein the action end of an over-torque signal feedback device for feeding back an over-torque signal to a control unit is connected with the tapping torque protection part; the main shaft part is connected with an operating handle used for providing initial downward pressure for the main shaft, and the main shaft part is provided with a tapping depth limiting device used for controlling the motor to rotate reversely after tapping depth is in place.
Wherein the main shaft part comprises a main shaft which is arranged in a main shaft outer sleeve, a steel ball sleeve arranged on the main shaft and a spring above the steel ball sleeve are separated by a lower annular positioning table on the inner wall of the main shaft outer sleeve, an end face pressure plate positioned below the steel ball sleeve is fixed in the main shaft outer sleeve, the lower end of the main shaft penetrates through the end face pressure plate and extends out of the main shaft outer sleeve to be fixedly connected with the upper end of the tapping torque protection part, the upper end of the spring is abutted against the upper annular positioning table, the upper end of the main shaft is in adaptive connection with two end face bearings positioned above the upper annular positioning table, a bearing sleeve positioned and installed by the end face bearings is arranged between the two end face bearings, a bearing pressing block for pressing the end face bearing and the bearing sleeve on the upper annular positioning table is fixed at the upper end part of the main shaft, the upper end face of the bearing pressing block is provided with a flat hole matched with the lower end of the coupler, and the lower end of the coupler penetrates through the flat hole and extends into the axial hole of the main shaft; the outer wall surface of the main shaft outer sleeve is provided with an axial groove which is parallel to the axial direction of the main shaft outer sleeve and is communicated with the inside of the main shaft outer sleeve, one end of the operating handle penetrates through the axial groove to be fixedly connected with the bearing sleeve, the other end of the operating handle is positioned on the outer side of the main shaft outer sleeve, and the other end of the operating handle is provided with a control button which is connected with the control unit and is used for controlling the motor to rotate forwards, rotate backwards and stop.
Furthermore, the signal feedback end of the over-torque signal feedback device comprises a conductive slip ring and an electric brush with an arc structure, two annular grooves are formed on the outer circumferential wall of the main shaft between the two end face bearings, two planar grooves are symmetrically arranged on two sides of the two annular grooves, after the annular groove and the plane groove are insulated, the end parts of the two electric brushes which are rotationally and symmetrically arranged at the annular groove are fixed on the corresponding side plane groove through an insulating seat, two connecting ends at the upper end of the signal wire connected with the action end of the over-torque signal feedback device penetrate through the axial hole from the corresponding side plane groove and the hole on the insulating seat and then are fixedly connected with the end part of the arc-shaped electric brush at the corresponding position, after the bearing sleeve and the two conductive slip rings positioned in the bearing sleeve are subjected to insulation treatment, the conductive slip rings in contact with the electric brush are concentrically and fixedly connected in the bearing sleeve, the conductive slip ring is connected with the control unit after being led out through the bearing sleeve and the operating handle through a data line.
Furthermore, a plane is processed on the outer circumferential wall of the bearing sleeve, one end of the operating handle penetrating through the axial groove is matched and screwed with a threaded hole in the plane of the outer circumferential wall of the bearing sleeve through a bolt, a U-shaped groove is formed in the position adjacent to the plane on the outer circumferential wall of the bearing sleeve, a wire outlet hole is formed in the bottom surface of the U-shaped groove, and a data wire connected with the conductive slip ring is led out through the wire outlet hole and the hole in the operating handle.
Further, the tapping torque protection part comprises a connecting handle with a step-shaped external shape of small top and large bottom, the small end of the connecting handle is fixedly connected with the lower end of the main shaft, the connecting handle is axially provided with step-shaped holes penetrating through the upper end surface and the lower end surface, a step-shaped clamping rod with the outer diameter of the upper end smaller than that of the lower end is arranged below the connecting handle, the upper end of the clamping rod is in clearance fit with the lower end of the step-shaped holes, a positioning table at the transition position of the small diameter and the large diameter on the clamping rod is positioned at the lower end surface of the connecting handle, an upper pawl matched with the positioning table and the large diameter of the clamping rod and used for axially positioning the clamping rod is fixed on the bottom surface of the lower pawl, a lower pawl and a lower coupler matched with the clearance clamping rod are arranged below the upper pawl, the cross section of the lower pawl is in a U-shaped structure, and the lower coupler is fixed on the bottom surface of the lower pawl, the ratchet that lower pawl up end set up and the ratchet adaptation meshing of last pawl lower extreme face, locate in the recess of lower pawl and with the last shaft coupling of lower shaft coupling adaptation and clamping rod fixed connection, the cover is equipped with the upper end and supports under the pawl terminal surface and the lower extreme supports on the spring I on the bottom surface in the adjusting collar lower extreme on the clamping rod, adjusting collar upper end and connecting handle big head end lower part threaded connection, be fixed with on the connecting handle big head end upper end terminal surface and indicate the cover lower extreme and adjust the cover upper end clearance fit, the system has annular groove on the adjusting collar outer circumferential wall.
Furthermore, a convex block is arranged on the upper end face of the lower coupler, a groove which is matched and meshed with the convex block is arranged on the lower end face of the upper coupler, and after the upper pawl and the lower pawl slide along the meshed tooth surface under the over-torque condition, the lower pawl drives the lower coupler to move downwards along the axial direction until the lower coupler is separated from the upper coupler, and the lower coupler stops rotating with a screw tap at the lower end.
Further, the action end of the over-torque signal feedback device comprises an upper signal seat and a lower signal seat, the upper signal seat and the lower signal seat are both composed of an insulation sleeve with an arc-shaped structure and a metal sheet fixed on the insulation sleeve, a counter bore is formed in the outer wall of the insulation sleeve, the metal sheets on the upper signal seat and the lower signal seat are arranged in opposite directions, the insulation sleeve on the upper signal seat is fixed on the outer circumferential wall of the upper pawl through a counter screw matched in the counter bore, the insulation sleeve on the lower signal seat is fixed on the outer circumferential wall of the lower pawl through a counter screw matched in the counter bore, the upper pawl and the lower pawl slide to the metal sheet on the upper signal seat to be contacted with the metal sheet on the lower signal seat along the meshing tooth surface under over-torque, an inclined hole communicated with the small diameter of the stepped hole is formed in the bottom surface of the step at the lower end of the connecting handle, and two connecting ends at the lower end of the signal wire connected with two electric brushes at the signal feedback end of the over-torque signal feedback device pass through the axial hole of the main shaft, The stepped hole and the inclined hole are respectively connected with the metal sheets on the upper signal seat and the lower signal seat.
Furthermore, the tapping depth limiting device comprises a depth limiting block and a depth control switch, the depth control switch is fixed on the lower end face of the operating handle, the depth limiting block which is positioned below the operating handle and corresponds to the depth control switch is mounted on the outer wall of the main shaft part in a height-adjustable mode, and a clock type dial indicator used for measuring and adjusting tapping depth is fixed at the outer end of the depth limiting block.
Furthermore, a T-shaped guide groove is formed in the outer wall of the main shaft part below the operating handle, a sliding nut is matched in the T-shaped guide groove, the depth limiting block is of an L-shaped structure, a connecting bolt penetrating through a counter bore in a bottom plate of the depth limiting block is matched and screwed with the sliding nut, a side plate of the depth limiting block corresponds to the depth control switch in position, and the depth limiting block presses down the depth control switch to control the motor to rotate reversely; the clock type dial indicator is fixedly installed at the outer end part of the side plate of the depth limiting block.
Furthermore, the upright post sleeve is provided with an installation sleeve which moves up and down along the height direction of the upright post sleeve, the installation sleeve is fixed on the upright post in a height-adjustable manner through a tightening bolt arranged on the side wall of the installation sleeve and an arc-shaped pressing block in an annular groove in the installation sleeve, the inner end part of the cantilever is fixedly connected with the installation sleeve, and the outer end part of the cantilever is fixedly connected with the outer wall of the main shaft part.
Compared with the prior art, the invention has the advantages that:
1. according to the technical scheme, a main shaft part with a tapping torque protection part fixed at the lower end is fixed on an upright post on a base through a cantilever, a motor arranged at the top of the main shaft part provides rotary power for a main shaft in the main shaft part, a screw tap clamped at the lower end of the tapping torque protection part rotates, an over-torque signal feedback device with an action end connected with the main shaft part and a signal feedback end connected with the tapping torque protection part feeds back an over-torque signal to a control unit, the control unit controls the motor to perform an anti-breaking protection function on the screw tap after being reversely rotated, and the problem that the screw tap is broken due to overlarge torque in a small-thread tapping process is solved;
2. according to the technical scheme, through the arrangement of the torque signal feedback device, zero abrasion of the lower coupling on the tapping torque protection part is almost realized in the machining process, the reliability and the service life are greatly increased, the problems that the efficiency is low in small thread tapping and the motor is difficult to accurately set the number of turns to control the positive and negative rotation of the motor are effectively solved, the small thread machining efficiency is improved, and the labor intensity of workers is obviously reduced;
3. according to the technical scheme, the tapping depth limiting device is arranged, the depth limiting block arranged on the outer wall of the main shaft part triggers the depth control switch on the lower end face of the operating handle after the tapping depth of the small screw threads is in place, the screw tap is controlled to withdraw from a part after the motor rotates reversely, the automatic tapping of the small screw threads is realized, the processing procedure and the difficulty of the small screw thread hole are simplified, and the structure of the tapping machine is optimized;
4. according to the technical scheme, the depth limiting block is arranged in the T-shaped guide groove in an adjustable mode, so that the position of the depth limiting block can be conveniently adjusted according to the depth of the small threaded hole, automatic machining of small threads at different depths is achieved, and the application range is wide;
5. in this technical scheme tapping moment of torsion protection part, rely on the biggest protection moment of torsion among the pressure adjustment tapping process of change and adjustment spring I, the control range of spring I is great, can reach 10mm, ratchet inclined plane angle's reasonable design on pawl and the lower pawl through the cooperation, can conveniently realize the adjustment of protection moment of torsion, make tapping moment of torsion protection part can adapt to the processing needs of various specification screw threads within M1-M3, solve tapping moment of torsion protection problem, reach the comprehensive protection to the screw tap among the little screw thread tapping process, prevent the screw tap fracture, the protection is qualified by tapping zero subassembly stable in quality, because this protection architecture is reliable, sensitivity is high, just can realize the processing needs of various specification screw threads below M1 and above M3 through changing spring I.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the spindle part of the present invention;
FIG. 3 is a schematic structural view of a tapping torque protection portion of the present invention;
FIG. 4 is a schematic view of the brush of the present invention mounted on the spindle;
fig. 5 is a schematic view of a connection structure of the conductive slip ring and the bearing housing according to the present invention.
Detailed Description
In the following, an embodiment of the present invention will be described in conjunction with fig. 1 to 5, so as to clearly and completely describe the technical solutions, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, not the whole embodiment.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The tapping machine for small threads with the screw tap breakage-proof protection function comprises a base 1 and an upright post 2 fixed on the base 1, wherein a cantilever 3 is arranged on the upright post 2, specifically, the upright post 2 is sleeved with a mounting sleeve 12 moving up and down along the height direction of the upright post, the mounting sleeve 12 is fixed on the upright post 2 in a height-adjustable manner through a puller bolt arranged on the side wall of the mounting sleeve and an arc-shaped pressing block in an annular groove in the mounting sleeve 12, the inner end part of the cantilever 3 is fixedly connected with the mounting sleeve 12, and the outer end part of the cantilever 3 is fixedly connected with the outer wall of a main shaft part 4; a main shaft part 4 is fixed at the outer end part of the cantilever 3, a motor base 9 is fixed at the top of the main shaft part 4, a motor 5 is arranged on the motor base 9, and an output shaft of the motor 5 is connected with the upper end of a main shaft 4-1 in the main shaft part 4 through a coupler; the lower end of the main shaft part 4 is provided with a tapping torque protection part 6, and the motor 5 drives the main shaft 4-1 and the tapping torque protection part 6 to rotate and then drives a screw tap clamped at the lower end of the tapping torque protection part 6 to rotate; the action end of an over-torque signal feedback device 11 for feeding back an over-torque signal to the control unit is connected with the tapping torque protection part 6, the signal feedback end of the tapping torque protection part 6 is connected with the main shaft 4-1, and the action end and the signal feedback end of the over-torque signal feedback device 11 are connected through a signal line; the main shaft part 4 is connected with an operating handle 7 used for providing initial downward pressure for the main shaft 4-1, and the main shaft part 4 is provided with a tapping depth limiting device 8 used for controlling the motor 5 to rotate reversely after the tapping depth is in place; in the structure, a main shaft part 4 with a tapping torque protection part 6 fixed at the lower end is fixed on an upright post 2 on a base 1 through a cantilever 3, a motor 5 arranged at the top of the main shaft part 4 provides rotary power for a main shaft 4-1 in the main shaft part 4, so that a tap clamped at the lower end of the tapping torque protection part 6 rotates, an over-torque signal feedback device 11 with an action end connected with the main shaft 4-1 and a signal feedback end connected with the tapping torque protection part 6 feeds back an over-torque signal to a control unit, the control unit controls the motor 5 to perform an anti-breaking protection function on the tap after being reversely rotated, and the problem that the tap is broken due to overlarge torque in a small-thread tapping process is solved; due to the arrangement of the over-torque signal feedback device 11, zero abrasion of the tapping torque protection part 6 is almost realized in the machining process, the reliability and the service life are greatly increased, the problems that the efficiency in small thread tapping is low and the motor 5 is difficult to accurately set the number of turns to control the positive and negative rotation of the motor are effectively solved, the small thread machining efficiency is improved, and the labor intensity of workers is obviously reduced;
as shown in fig. 2, the specific structure of the main shaft portion 4 is as follows: the main shaft part 4 comprises a main shaft 4-1, the main shaft 4-1 is arranged in a main shaft outer sleeve 4-2, a steel ball sleeve 4-3 arranged on the main shaft 4-1 and a spring 4-4 above the steel ball sleeve 4-3 are separated by a lower annular positioning table 4-5 on the inner wall of the main shaft outer sleeve 4-2, an end surface pressing plate 4-6 positioned below the steel ball sleeve 4-3 is fixed in the main shaft outer sleeve 4-2, the lower end of the main shaft 4-1 penetrates through the end surface pressing plate 4-6 to extend out of the main shaft outer sleeve 4-2 to be fixedly connected with the upper end of a connecting handle 6-1 in a tapping torque protection part 6, the upper end of the spring 4-4 is abutted against an upper annular positioning table 4-7, the upper end of the main shaft 4-1 is in adaptive connection with two end surface bearings 4-8 positioned above the upper annular positioning table 4-7, a bearing sleeve 4-9 positioned and installed by depending on the end face bearing 4-8 is arranged between the two end face bearings 4-8, a bearing pressing block 4-11 for pressing the end face bearing 4-8 and the bearing sleeve 4-9 on the upper annular positioning table 4-7 is fixed at the upper end part of the main shaft 4-1, a flat hole 4-12 matched with the lower end of the coupler is formed in the upper end face of the bearing pressing block 4-11, and the lower end of the coupler penetrates through the flat hole 4-12 and extends into an axial hole 4-13 of the main shaft 4-1; an axial groove 4-10 which is parallel to the axial direction of the main shaft outer sleeve 4-2 and is communicated with the interior of the main shaft outer sleeve 4-2 is formed in the outer wall surface of the main shaft outer sleeve 4-2, one end of an operating handle 7 penetrates through the axial groove 4-10 to be fixedly connected with a bearing sleeve 4-9, the operating handle 7 can move up and down along the axial groove 4-10, the other end of the operating handle 7 is positioned on the outer side of the main shaft outer sleeve 4-2, and a control button 10 which is connected with a control unit and used for controlling the motor 5 to rotate forwards, reversely and stop is arranged at the other end of the operating handle 7;
the main shaft 4-1 is guided and centered through the steel ball sleeve 4-3 and the main shaft outer sleeve 4-2, the spring 4-4 supports the tapping torque protection part 6, the main shaft 4-1 and the weight of parts mounted on the main shaft 4-1, the elastic modulus is required to be small, the action of a counterweight force is achieved, the main shaft 4-1 is flexible in moving up and down, and the main shaft 4-1 can move up and down only by applying a small axial force to the main shaft 4-1 by a screw tap in the tapping process; two end face bearings 4-8 are mounted at an upper annular positioning table 4-7 of the main shaft 4-1, a bearing sleeve 4-9 is arranged between the two end face bearings 4-8, and the operating handle 7 is connected with the bearing sleeves 4-9, so that the operating handle 7 cannot be influenced by the rotation of the main shaft 4-1 when moving up and down along an axial groove 4-10, the bearing pressing block 4-11 not only plays a role of fixing the end face bearings 4-8 and the bearing sleeves 4-9, but also plays a role of transmitting torque through a coupler connected with the motor 5 through a flat hole 4-12 in the middle of the bearing pressing block 4-11.
As shown in fig. 4 to 5, the connection structure of the signal feedback end of the over-torque signal feedback device 11 and the main shaft part 4 is as follows: the signal feedback end of the over-torque signal feedback device 11 comprises a conductive slip ring 11-1 and an electric brush 11-2 with an arc structure, two annular grooves 4-14 are formed on the outer circumferential wall of a main shaft 4-1 between two end face bearings 4-8, two planar grooves are symmetrically arranged on two sides of the two annular grooves 4-14, the annular grooves 4-14 and the planar grooves are insulated, the end parts of the two electric brushes 11-2 which are rotationally and symmetrically arranged at the annular grooves 4-14 are fixed on the corresponding side planar grooves through insulating seats 4-15, two connecting ends at the upper end of a signal wire connected with the action end of the over-torque signal feedback device 11 penetrate through holes on the corresponding side planar grooves and insulating seats 4-15 through axial holes 4-13 and then are fixedly connected with the end parts of the arc electric brushes 11-2 at the corresponding positions, after the insulation processing is carried out between the bearing sleeve 4-9 and the two conductive slip rings 11-1 positioned in the bearing sleeve 4-9 by using an insulation sleeve, the conductive slip rings 11-1 contacted with the electric brushes 11-2 are concentrically and fixedly connected in the bearing sleeve 4-9, and the conductive slip rings 11-1 are led out by the bearing sleeve 4-9 and the operating handle 7 through data lines and then are connected with a control unit; specifically, a plane is processed on the outer circumferential wall of the bearing sleeve 4-9, one end of an operating handle 7 penetrating through the axial groove 4-10 is matched and screwed with a threaded hole 4-17 in the plane of the outer circumferential wall of the bearing sleeve 4-9 through a bolt, a U-shaped groove is arranged at the position adjacent to the plane on the outer circumferential wall of the bearing sleeve 4-9, a wire outlet 4-16 is formed in the bottom surface of the U-shaped groove, and a data wire connected with the conductive slip ring 11-1 is led out through the wire outlet 4-16 and a hole in the operating handle 7.
The insulating base 4-15 is riveted with the electric brush 11-2 through a hollow rivet, a signal wire is welded in a hole of the electric brush 11-2, finally the insulating base 4-15 is bonded with the main shaft 4-1 through glue, and the rivet and the signal wire can not protrude out of the excircle of the main shaft 4-1;
as shown in fig. 3, the tapping torque protection part 6 has the following specific structure: the tapping torque protection part 6 comprises a connecting handle 6-1 with a step-shaped outer shape of small top and large bottom, the small end of the connecting handle 6-1 is fixedly connected with the lower end of a main shaft 4-1, step-shaped holes 6-2 penetrating through the upper end surface and the lower end surface are axially formed in the connecting handle 6-1, a step-shaped clamping rod 6-3 with the outer diameter of the upper end smaller than that of the lower end is arranged below the connecting handle 6-1, the upper end of the clamping rod 6-3 is in clearance fit with the lower end of the step-shaped hole 6-2, a positioning table 6-4 on the clamping rod 6-3 at the transition position of small diameter and large diameter is positioned at the lower end surface of the connecting handle 6-1, an upper pawl 6-5 which is matched with the positioning table 6-4 and the large diameter position of the clamping rod 6-3 and axially positions the clamping rod 6-3 is fixed on the bottom surface of the step at the lower end of the connecting handle 6-1, a lower pawl 6-6 and a lower coupler 6-7 which are in clearance fit with the clamping rod 6-3 are arranged below the upper pawl 6-5, the cross section of the lower pawl 6-6 is in a U-shaped structure, the lower coupler 6-7 is fixed on the bottom surface of the lower pawl 6-6, a ratchet arranged on the upper end surface of the lower pawl 6-6 is in fit engagement with a ratchet on the lower end surface of the upper pawl 6-5, an upper coupler 6-8 which is arranged in a groove of the lower pawl 6-6 and is in fit connection with the lower coupler 6-7 is fixedly connected with the clamping rod 6-3, a spring I6-10 is sleeved on the clamping rod 6-3, the upper end of the spring I abuts against the lower end surface of the lower pawl 6-6, the lower end of the spring I abuts against the inner bottom surface of the lower end of the adjusting sleeve 6-9, the upper end of the adjusting sleeve 6-9 is in threaded connection with the lower part of the big head end of the connecting handle 6-1, an indicating sleeve 6-11 is fixed on the end face of the upper part of the big head end of the connecting handle 6-1, the lower end of the indicating sleeve 6-11 is in clearance fit with the upper end of the adjusting sleeve 6-9, and an annular reticle is arranged on the outer circumferential wall of the adjusting sleeve 6-9.
The specific adaptive meshing structure of the lower coupler 6-7 and the upper coupler 6-8 is as follows: the upper end face of the lower coupler 6-7 is provided with a convex block, the lower end face of the upper coupler 6-8 is provided with a groove which is matched and meshed with the convex block, the upper pawl 6-5 and the lower pawl 6-6 slide along a meshed tooth surface under the over-torque condition until the lower pawl 6-6 drives the lower coupler 6-7 to move downwards along the axial direction until the lower coupler 6-8 is disengaged, and then the lower coupler 6-3 and a screw tap at the lower end stop rotating; in the tapping torque protection part 6, the maximum protection torque in the tapping process is adjusted by replacing and adjusting the pressure of a spring I6-10, the adjustment range of the spring I6-10 is large and can reach 10mm, the adjustment of the protection torque can be conveniently realized by matching with the reasonable design of the angles of the inclined planes of the ratchets on the upper pawl 6-5 and the lower pawl 6-6, so that the tapping torque protection part 6 can meet the processing requirements of threads with various specifications within M1-M3, the tapping torque protection problem is solved, the comprehensive protection of a tap in the small-thread tapping process is realized, the fracture of the tap is prevented, the quality of a tapped part is protected, and the quality of the tapped part is stable and qualified, and the protection structure is reliable and high in sensitivity, and the processing requirements of threads with various specifications below M1 and above M3 can be realized by replacing the spring I6-10;
the specific connection structure of the action end of the over-torque signal feedback device 11 and the tapping torque protection part 6 is as follows: the action end of the over-torque signal feedback device 11 comprises an upper signal seat 11-3 and a lower signal seat 11-4, the upper signal seat 11-3 and the lower signal seat 11-4 are both composed of an insulation sleeve with an arc structure and a metal sheet fixed on the insulation sleeve, counter bores are formed in the outer wall of the insulation sleeve, the metal sheets on the upper signal seat 11-3 and the lower signal seat 11-4 are arranged in opposite directions, the insulation sleeve on the upper signal seat 11-3 is fixed on the outer circumferential wall of the upper pawl 6-5 through counter screws matched in the counter bores, the insulation sleeve on the lower signal seat 11-4 is fixed on the outer circumferential wall of the lower pawl 6-6 through counter screws matched in the counter bores, and the upper pawl 6-5 and the lower pawl 6-6 slide a small distance along the meshing tooth surface under over-torque (at the moment, the upper coupler 6-8 and the lower coupler 6-7 are not disengaged yet) to the upper signal seat 11 The metal sheet on the-3 is contacted with the metal sheet on the lower signal seat 11-4, the bottom surface of the step at the lower end of the connecting handle 6-1 is provided with an inclined hole 6-12 communicated with the small diameter of the step-shaped hole 6-2, and two connecting ends at the lower end of the signal wire connected with the two electric brushes 11-2 at the signal feedback end of the over-torque signal feedback device 11 are respectively connected with the metal sheets on the upper signal seat 11-3 and the lower signal seat 11-4 through the axial hole 4-13, the step-shaped hole 6-2 and the inclined hole 6-12 of the main shaft 4-1.
When the tapping torque is increased, the upper pawl 6-5 and the lower pawl 6-6 slide along the meshing tooth surface, when a certain distance is reached, the metal sheets on the upper signal seat 11-3 and the lower signal seat 11-4 are communicated, and after the metal sheets on the upper signal seat 11-3 and the lower signal seat 11-4 are communicated, a signal is transmitted to the control unit through a signal wire, the main shaft 4-1 is controlled to rotate reversely, and the screw tap rotates reversely and exits; in addition, after a data line feedback signal is added, the lower coupler 6-7 and the upper coupler 6-8 are mechanically disconnected for protection under the feedback of an electric signal, the service life of the tapping torque protection part 6 is greatly prolonged, meanwhile, a mechanical protection mechanism can also prevent the electric appliance from being failed in protection and play a role in secondary protection, and the metal sheet adopts a copper contact sheet.
As shown in fig. 3, the tapping depth limiter 8 has the following specific structure: the tapping depth limiting device 8 comprises a depth limiting block 8-1 and a depth control switch 8-2, the depth control switch 8-2 is fixed on the lower end face of the operating handle 7, the depth limiting block 8-1 which is positioned below the operating handle 7 and corresponds to the depth control switch 8-2 is mounted on the outer wall of the main shaft part 4 in a height-adjustable manner, and a clock type dial indicator 8-5 for measuring and adjusting tapping depth is fixed at the outer end part of the depth limiting block 8-1; specifically, a T-shaped guide groove 8-3 is formed in the outer wall of the main shaft part 4 below the operating handle 7, a sliding nut 8-4 is adapted in the T-shaped guide groove 8-3, the depth limiting block 8-1 is of an L-shaped structure, a connecting bolt 8-6 penetrating through a counter bore in a bottom plate of the depth limiting block 8-1 is adapted to be screwed with the sliding nut 8-4, a side plate of the depth limiting block 8-1 corresponds to the depth control switch 8-2 in position, and the motor 5 is controlled to rotate reversely after the depth limiting block 8-1 presses down the depth control switch 8-2; the clock type dial indicator 8-5 is fixedly arranged at the outer end part of the side plate of the depth limiting block 8-1; in the structure, the tapping depth limiting device 8 is arranged, the depth limiting block 8-1 arranged on the outer wall of the main shaft part 4 triggers the depth control switch 8-2 on the lower end face of the operating handle 7 after the tapping depth of the small screw thread is in place, and the screw tap retreats from a part after the motor 5 is controlled to rotate reversely, so that the automatic tapping of the small screw thread is realized, the processing procedure and difficulty of the small screw thread hole are simplified, and the structure of the tapping machine is optimized; the depth limiting block 8-1 is arranged in the T-shaped guide groove 8-3 in an adjustable mode, so that the position of the depth limiting block 8-1 can be adjusted conveniently according to the depth of the small threaded hole, automatic machining of small threads with different depths is achieved, and the application range is wide;
the electric signal is transmitted by utilizing the contact of the two copper contact pieces, when the tapping torque received by the screw tap reaches the preset maximum value of the adjusting sleeve 6-9, the two metal pieces (the copper contact pieces) are contacted to generate a feedback electric signal to control the motor 5 to rotate reversely, the motor 5 rotates forwards through time delay control, the tapping is continued until the specified depth is machined, at the moment, the depth limiting block 8-1 presses the depth control switch 8-2, the motor 5 rotates backwards, and the control unit controls the screw tap to withdraw from a part; from above process can see, this structure sets for the biggest tapping moment of torsion through machinery, has realized the torque control among the tapping process, can furthest reduce the number of times of backing back among the tapping process, and work efficiency has greatly promoted, and the tapping process does not receive processing material, aperture size, coolant liquid, the screw tap wearing and tearing condition, logical/blind hole restriction, as long as the intensity according to used screw tap sets up protection moment of torsion size, just can realize continuous screw tap in the course of working, and it is also more convenient to operate.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and therefore, all equivalent changes made by the contents of the claims of the present invention should be included in the claims of the present invention.
Claims (9)
1. Tapping machine for small thread with screw tap prevents disconnected protect function, its characterized in that: the device comprises a base (1) and an upright post (2) fixed on the base (1), wherein a cantilever (3) is arranged on the upright post (2), a main shaft part (4) is fixed at the outer end part of the cantilever (3), a motor base (9) is fixed at the top of the main shaft part (4), a motor (5) is arranged on the motor base (9), and an output shaft of the motor (5) is connected with the upper end of a main shaft (4-1) in the main shaft part (4) through a coupler; the lower end of the main shaft part (4) is provided with a tapping torque protection part (6), and the motor (5) drives the main shaft (4-1) and the tapping torque protection part (6) to rotate and then drives a screw tap clamped at the lower end of the tapping torque protection part (6) to rotate; the action end of an over-torque signal feedback device (11) for feeding back an over-torque signal to the control unit is connected with the tapping torque protection part (6), the signal feedback end of the tapping torque protection part (6) is connected with the main shaft (4-1), and the action end and the signal feedback end of the over-torque signal feedback device (11) are connected through a signal line; the main shaft part (4) is connected with an operating handle (7) used for providing initial downward pressure for the main shaft (4-1), and the main shaft part (4) is provided with a tapping depth limiting device (8) used for controlling the motor (5) to rotate reversely after tapping depth is in place;
the main shaft part (4) comprises a main shaft (4-1), the main shaft (4-1) is arranged in a main shaft outer sleeve (4-2), a steel ball sleeve (4-3) arranged on the main shaft (4-1) and a spring (4-4) above the steel ball sleeve (4-3) are separated by a lower annular positioning table (4-5) on the inner wall of the main shaft outer sleeve (4-2), an end surface pressing plate (4-6) positioned below the steel ball sleeve (4-3) is fixed in the main shaft outer sleeve (4-2), the lower end of the main shaft (4-1) penetrates through the end surface pressing plate (4-6) to extend out of the main shaft outer sleeve (4-2) to be fixedly connected with the upper end of a tapping torque protection part (6), the upper end of the spring (4-4) abuts against the upper annular positioning table (4-7), the upper end of the main shaft (4-1) is connected with two end face bearings (4-8) positioned above the upper annular positioning table (4-7) in a matched manner, a bearing sleeve (4-9) positioned and installed by the end face bearings (4-8) is arranged between the two end face bearings (4-8), a bearing pressing block (4-11) for pressing the end face bearings (4-8) and the bearing sleeve (4-9) on the upper annular positioning table (4-7) is fixed at the upper end of the main shaft (4-1), a flat hole (4-12) matched with the lower end of the coupler is formed in the upper end face of the bearing pressing block (4-11), and the lower end of the coupler penetrates through the flat hole (4-12) and extends into an axial hole (4-13) of the main shaft (4-1); the outer wall surface of the main shaft outer sleeve (4-2) is provided with an axial groove (4-10) which is parallel to the axial direction of the main shaft outer sleeve and is communicated with the inner part of the main shaft outer sleeve (4-2), one end of an operating handle (7) penetrates through the axial groove (4-10) to be fixedly connected with a bearing sleeve (4-9), the other end of the operating handle (7) is positioned on the outer side of the main shaft outer sleeve (4-2), and the other end of the operating handle (7) is provided with a control button (10) which is connected with a control unit and is used for controlling the motor (5) to rotate forwards, rotate backwards and stop.
2. The tapping machine for small threads having a tap breakage prevention function according to claim 1, characterized in that: the signal feedback end of the over-torque signal feedback device (11) comprises a conductive slip ring (11-1) and an electric brush (11-2) with an arc structure, two annular grooves (4-14) are formed in the outer circumferential wall of the main shaft (4-1) between the two end face bearings (4-8), two planar grooves are symmetrically arranged on two sides of the two annular grooves (4-14), after the annular grooves (4-14) and the planar grooves are subjected to insulation treatment, the end parts of the electric brush (11-2) rotationally and symmetrically arranged at the annular grooves (4-14) are fixed on the corresponding side planar grooves through insulation seats (4-15), two connecting ends at the upper end of a signal wire connected with the action end of the over-torque signal feedback device (11) penetrate through holes in the corresponding side planar grooves and the insulation seats (4-15) through axial holes (4-13) and then are fixedly connected with the end parts of the arc electric brush (11-2) at the corresponding position, after insulation processing is carried out between the bearing sleeve (4-9) and the two conductive slip rings (11-1) positioned in the bearing sleeve (4-9), the conductive slip rings (11-1) contacted with the electric brushes (11-2) are concentrically and fixedly connected in the bearing sleeve (4-9), and the conductive slip rings (11-1) are led out through the bearing sleeve (4-9) and the operating handle (7) through data lines and then are connected with a control unit.
3. The tapping machine for small threads having a tap breakage prevention function according to claim 2, characterized in that: one end of an operating handle (7) which is provided with a plane and penetrates through the axial groove (4-10) is processed on the outer circumferential wall of the bearing sleeve (4-9) and is matched and screwed with a threaded hole (4-17) on the plane of the outer circumferential wall of the bearing sleeve (4-9) through a bolt, a U-shaped groove is arranged at the position adjacent to the plane on the outer circumferential wall of the bearing sleeve (4-9), a wire outlet hole (4-16) is formed in the bottom surface of the U-shaped groove, and a data wire connected with the conductive slip ring (11-1) is led out through the wire outlet hole (4-16) and a hole in the operating handle (7).
4. The tapping machine for small threads having a tap breakage prevention function according to claim 1, characterized in that: the tapping torque protection part (6) comprises a connecting handle (6-1) with the external shape of a step shape with a small upper part and a large lower part, the small end of the connecting handle (6-1) is fixedly connected with the lower end of a main shaft (4-1), step-shaped holes (6-2) penetrating through the upper end face and the lower end face are axially formed in the connecting handle (6-1), step-shaped clamping rods (6-3) with the upper end outer diameter smaller than the lower end outer diameter are arranged below the connecting handle (6-1), the upper ends of the clamping rods (6-3) are in clearance fit with the lower ends of the step-shaped holes (6-2), positioning platforms (6-4) at the transition positions of the small diameter and the large diameter on the clamping rods (6-3) are located at the lower end face of the connecting handle (6-1), and positioning platforms (6-4) and the large diameter positions of the clamping rods (6-3) are fixed on the step bottom face of the lower end of the connecting handle (6-1) and are matched and clamped with the positioning platforms (6-4) and the large diameter positions of the clamping rods (6-3) An upper pawl (6-5) axially positioned on the rod (6-3), a lower pawl (6-6) and a lower coupler (6-7) which are in clearance fit with the clamping rod (6-3) are arranged below the upper pawl (6-5), the cross section of the lower pawl (6-6) is in a U-shaped structure, the lower coupler (6-7) is fixed on the bottom surface of the lower pawl (6-6), a ratchet arranged on the upper end surface of the lower pawl (6-6) is in fit engagement with a ratchet on the lower end surface of the upper pawl (6-5), an upper coupler (6-8) which is arranged in a groove of the lower pawl (6-6) and is in fit connection with the lower coupler (6-7) is fixedly connected with the clamping rod (6-3), the upper end of the clamping rod (6-3) is abutted against the lower end surface of the lower pawl (6-6), and the lower end of the clamping rod (6-3) is abutted against the lower end of the adjusting sleeve (6-9) The spring I (6-10) on the inner bottom surface of the end, the upper end of the adjusting sleeve (6-9) is in threaded connection with the lower part of the large head end of the connecting handle (6-1), an indicating sleeve (6-11) is fixed on the upper end face of the large head end of the connecting handle (6-1), the lower end of the indicating sleeve (6-11) is in clearance fit with the upper end of the adjusting sleeve (6-9), and an annular reticle is manufactured on the outer circumferential wall of the adjusting sleeve (6-9).
5. The tapping machine for small threads having a tap breakage prevention function according to claim 4, characterized in that: the upper end face of the lower coupler (6-7) is provided with a convex block, the lower end face of the upper coupler (6-8) is provided with a groove which is in fit engagement with the convex block, the upper pawl (6-5) and the lower pawl (6-6) slide to the lower pawl (6-6) along the engagement tooth surface under the over-torque condition to drive the lower coupler (6-7) to move downwards along the axial direction to be disengaged from the upper coupler (6-8), and then the clamping rod (6-3) and the screw tap at the lower end of the clamping rod stop rotating.
6. The tapping machine for small threads having a tap breakage prevention function according to claim 5, characterized in that: the action end of the over-torque signal feedback device (11) comprises an upper signal seat (11-3) and a lower signal seat (11-4), the upper signal seat (11-3) and the lower signal seat (11-4) are both composed of an insulation sleeve of an arc structure and a metal sheet fixed on the insulation sleeve, counter bores are formed in the outer wall of the insulation sleeve, the metal sheets on the upper signal seat (11-3) and the lower signal seat (11-4) are oppositely arranged, the insulation sleeve on the upper signal seat (11-3) is fixed on the outer circumferential wall of an upper pawl (6-5) through counter screws matched in the counter bores, the insulation sleeve on the lower signal seat (11-4) is fixed on the outer circumferential wall of a lower pawl (6-6) through counter screws matched in the counter bores, and the upper pawl (6-5) and the lower pawl (6-6) slide to the upper signal seat (11-3) along the meshing tooth surface under over-torque The metal sheet is contacted with the metal sheet on the lower signal seat (11-4), an inclined hole (6-12) communicated with the small diameter of the stepped hole (6-2) is formed in the bottom surface of the step at the lower end of the connecting handle (6-1), and two connecting ends at the lower end of a signal wire connected with two electric brushes (11-2) at the signal feedback end of the over-torque signal feedback device (11) are respectively connected with the metal sheet on the upper signal seat (11-3) and the lower signal seat (11-4) through an axial hole (4-13), the stepped hole (6-2) and the inclined hole (6-12) of the main shaft (4-1).
7. The tapping machine for small threads having a tap breakage prevention function according to claim 1, characterized in that: the tapping depth limiting device (8) comprises a depth limiting block (8-1) and a depth control switch (8-2), the depth control switch (8-2) is fixed on the lower end face of an operating handle (7), the depth limiting block (8-1) which is located below the operating handle (7) and corresponds to the depth control switch (8-2) in position is mounted on the outer wall of the main shaft part (4) in a height-adjustable mode, and a clock type dial indicator (8-5) used for measuring and adjusting tapping depth is fixed at the outer end of the depth limiting block (8-1).
8. The tapping machine for small threads having a tap breakage prevention function according to claim 7, characterized in that: the outer wall of a main shaft part (4) below the operating handle (7) is provided with a T-shaped guide groove (8-3), a sliding nut (8-4) is adapted in the T-shaped guide groove (8-3), the depth limiting block (8-1) is of an L-shaped structure, a connecting bolt (8-6) penetrating through a counter bore in a bottom plate of the depth limiting block (8-1) is adapted and screwed with the sliding nut (8-4), a side plate of the depth limiting block (8-1) corresponds to the depth control switch (8-2), and the depth limiting block (8-1) is pressed down by the depth limiting block (8-1) to control the motor (5) to rotate reversely; the clock type dial indicator (8-5) is fixedly arranged at the outer end part of the side plate of the depth limiting block (8-1).
9. The tapping machine for small threads having a tap breakage prevention function according to any one of claims 1 to 8, characterized in that: the upright post (2) is sleeved with an installation sleeve (12) which moves up and down along the height direction of the upright post, the installation sleeve (12) is fixed on the upright post (2) in a height-adjustable mode through a puller bolt arranged on the side wall of the installation sleeve and an arc-shaped pressing block in an annular groove in the installation sleeve (12), the inner end part of the cantilever (3) is fixedly connected with the installation sleeve (12), and the outer end part of the cantilever (3) is fixedly connected with the outer wall of the main shaft part (4).
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| CN202011495854.3A CN112518049B (en) | 2020-12-17 | 2020-12-17 | Tapping machine for small thread with screw tap anti-breaking protection function |
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| CN202011495854.3A CN112518049B (en) | 2020-12-17 | 2020-12-17 | Tapping machine for small thread with screw tap anti-breaking protection function |
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| US5902077A (en) * | 1998-03-20 | 1999-05-11 | Marking Methods, Inc. | Variable speed universal drilling tapping and reaming machine |
| CN2606655Y (en) * | 2003-03-04 | 2004-03-17 | 杭州西湖台钻有限公司 | Bench type constant pitch tapping machine withy bottom protection |
| CN106077844A (en) * | 2016-06-26 | 2016-11-09 | 成都凯天电子股份有限公司 | Threaded hole machine |
| KR101928790B1 (en) * | 2017-07-07 | 2018-12-13 | 노창환 | Drill safety devices for drilling machines |
| CN108188500B (en) * | 2018-02-02 | 2020-11-17 | 西安理工大学 | Automatic tapping device based on torque sensor and tapping method thereof |
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